| 초록 |
The depolymerization of Protobind lignin into monoaromatic compounds was conducted with a batch reactor over transition metals supported on ZSM-5 catalysts in supercritical ethanol supplying in-situ hydrogen. It was observed that the trend of yields according to the amount of transition metal loading formed the volcano shape curve and had the linear correlation between yield of monoaromatic compounds and acid density. In addition, it was found that Cu metal among transition metals plays an important role in promoting the depolymerization of lignin. Cu/ZSM-5, which was loaded 10 wt.% Cu and was Si/Al2 ratio of 30, resulted in the highest yield of monoaromatic compounds; 98.2 wt%. Meanwhile, HSQC NMR analysis provided the evidence about the promotion of the depolymerization of Protobind lignin by hydrogenolysis and the alkylation of monoaromatic compounds by ethanol. |
